Line Shape Broadening in Surface Diffusion of Interacting Adsorbates with Quasielastic He Atom Scattering

Details Line Shape Broadening in Surface Diffusion of Interacting Adsorbates with Quasielastic He Atom Scattering Line Shape Broadening in Surface Diffusion of Interacting Adsorbates with Quasielastic He Atom Scattering

2007-02-08

arxiv.org/abs/cond-mat/0702219v2

Phys. Rev. Lett. 98, 216102 (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2 figures (slightly revised version)

Scientific paper

10.1103/PhysRevLett.98.216102

The experimental line shape broadening observed in adsorbate diffusion on metal surfaces with increasing coverage is usually related to the nature of the adsorbate-adsorbate interaction. Here we show that this broadening can also be understood in terms of a fully stochastic model just considering two noise sources: (i) a Gaussian white noise accounting for the surface friction, and (ii) a shot noise replacing the physical adsorbate-adsorbate interaction potential. Furthermore, contrary to what could be expected, for relatively weak adsorbate-substrate interactions the opposite effect is predicted: line shapes get narrower with increasing coverage.

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